#12670: Representation polymorphism validity check is too strict -------------------------------------+------------------------------------- Reporter: bgamari | Owner: Type: bug | Status: new Priority: normal | Milestone: 8.2.1 Component: Compiler (Type | Version: 8.0.1 checker) | Resolution: | Keywords: typeable Operating System: Unknown/Multiple | Architecture: | Unknown/Multiple Type of failure: None/Unknown | Test Case: Blocked By: | Blocking: Related Tickets: | Differential Rev(s): Wiki Page: | -------------------------------------+------------------------------------- Comment (by simonpj): Very good point. We can't make `Dyn res (f x)` unless `f x :: Type`, I agree. Let's see what Richard has to say. What is `Fun`? You're referring to some code I can't see. In any case, I'd remark that we don't necessarily need the full generality of `typeRepKind`; we only need to know the arguments to `(->)` when we take `rx` apart. -- Ticket URL: http://ghc.haskell.org/trac/ghc/ticket/12670#comment:13 GHC http://www.haskell.org/ghc/ The Glasgow Haskell Compiler